The pencil sketched ones, Sunspire especially, seem to be quite old. You can see one of the dates says 2002, and the Sunspire one actually says "(Hub3)" like in the beta...though in the drawing, the lava trench has been added. I wonder if at some point, the sunspire actually had all those platforms on it

It does indeed look like a war tower lol...too smooth and straight to be rock formation...I actually for some reason picture it in that picture as being triangular.